How to determine defective or not defective
(a) Measure continuity by removing the connector at
the edge of temperature detection.
(b) Resistance value at the edge of temperature
detection in normal condition.
(Unit kΩ)
°C Rmin. Rnom. Rmax.
-30 25.293 26.316 27.376
-20 15.125 15.572 16.031
-10 9.342 9.524 9.709
0 5.940 6.000 6.060
10 3.810 3.882 3.995
20 2.505 2.573 2.644
25 2.049 2.113 2.179
30 1.687 1.746 1.808
40 1.163 1.213 1.265
50 0.819 0.860 0.903
(c) If the resistance value is widely out of order,
remove it at the edge of the temperature detection
(with lead) and replace it.
(d) If the above resistance value is normal, check the
controller.
10.17 Td sensor (Td)
It detects delivery temperature of the compressor and
stops the refrigeration unit or opens the liquid injection
electromagnetic valve.
• If the delivery temperature becomes more than 125°C,
opens the liquid injection electromagnetic valve in
order to lower delivery temperature.
• If the delivery temperature becomes more than 135°C,
stops the refrigeration unit.
How to determine defective or not defective:
Measure the resistance value by removing the
connector.
Resistance value in normal condition
200°C 0.430kΩ 100°C 5.228kΩ
175°C 0.738kΩ 25°C 80.470kΩ
115°C 3.352kΩ
10.18 Controller
A new controller with a character display function has
been adopted, which enables to set digitally a desired
storage temperature accurately. In addition to it, pre-
operation inspection for the refrigeration unit can be
made by a simple button operation and a diagnosis at
the time of the unit being defective can also be made
easily.
Display function
• Operation indication lamp
• Defrost indication lamp
• Alarm lamp
• Hours indication lamp
• Display indication lamp
– 19 –
Storage temperature sensor Td sensor
Controller
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